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The English team achieved an important away win at the José Alvalade Stadium in Lisbon, putting one foot in the semi-finals before the second leg.
Substitutes Gabriel Martinelli and Kai Havertz made a difference, with the Brazilian setting up the only goal of the match for the German in the first minute of stoppage time, sealing a dramatic win for the London club.
The two teams will meet again next Wednesday at the Emirates Stadium in London to decide who progresses to the semi-finals.
The winner of this tie will go on to face either Barcelona or Atlético Madrid, who are scheduled to play their first leg at Camp Nou.